function s1_hello(){
  echo "hello, world!"
}
function s2_tell_who_i_am(){
  whoami
}
function s3_which_distro_do_i_use(){
  cat /etc/os-release | grep NAME | head -n 1
}
function s4_view_my_cpu_arch(){
  uname -m
}
function s5_show_first_scsi_disk_size(){
  lsblk -1 | \grep disk |\grep '^sda' |awk '{print $4}'
}
function s6_show_main_memory_size_in_megabytes(){
  free -m | awk 'NR== 2 {print $2}'
}
